Ext.grid.CheckColumn = function (config) {
	Ext.apply(this, config);
	if (!this.id) {
		this.id = Ext.id();
	}
	this.renderer = this.renderer.createDelegate(this);
};
Ext.grid.CheckColumn.prototype = {
	init:function (grid) {
		this.grid = grid;
		this.grid.on("render", function () {
			var view = this.grid.getView();
			view.mainBody.on("mousedown", this.onMouseDown, this);
		}, this);
	}, 
	onMouseDown:function (e, t) {
		if (t.className && t.className.indexOf("x-grid3-cc-" + this.id) != -1) {
			e.stopEvent();
			var index = this.grid.getView().findRowIndex(t);
			var record = this.grid.store.getAt(index);
			record.set(this.dataIndex, !record.data[this.dataIndex]);
		}
	}, 
	renderer:function (v, p, record) {
		p.css += " x-grid3-check-col-td";
		return "<div class=\"x-grid3-check-col" + (v ? "-on" : "") + " x-grid3-cc-" + this.id + "\">&#160;</div>";
	}
};